Pisanski, Tomaž; Randić, Milan (2000), «Bridges between geometry and graph theory», in Gorini, Catherine A. (ed.), Geometry at work, MAA Notes, vol. 53, Washington, DC: Math. Assoc. America, էջեր 174–194, MR1782654. See in particular Theorem 3, p. 176.
Pisanski, Tomaž; Randić, Milan (2000), «Bridges between geometry and graph theory», in Gorini, Catherine A. (ed.), Geometry at work, MAA Notes, vol. 53, Washington, DC: Math. Assoc. America, էջեր 174–194, MR1782654. See in particular Theorem 3, p. 176.
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